By birth, if both parents are citizens; By registration, if the person was officially registered in the census and living in Bhutan before the end of 1958, the date of the first citizenship act; By naturalisation, when the person must be at least 21 years old, or 15 years old in the case of a child only one of whose parents, mother or father, is a citizen.
• Por empadronamiento, si la persona de que se trata hubiere sido oficialmente empadronada en el censo y viviere en Bhután desde antes de la promulgación (a fines de 1958) de la primera Ley de ciudadanía;